When Bremmer came in and disbanded the military during his de-Baathification, he put hundreds of thousands of people out of work overnight in order to "start over from scratch". That, I believe, was a very fatal mistake and he should have simply cherry-picked key elements to remove and let the rest of the infrastructure of the country do it's thing. I am of the opinion that there would not have been an insurgency if we hadn't fired a couple hundred thousand people overnight who could have literally rectified the country within months, being in the positions that they were.
I wrote a long reply but everyone would have gotten dizzy from my grammar and punctuation.
Your paragraph above tells me all I need to know about your experience with U/W and the Iraq insurgency specifically. Getting you up to speed would take more time than I have.
In a nutshell: The insurgency was in place well before we crossed the LD. Iranian SF had been doing FID missions prior to the Baghdad Thunder Run. As far as Im concerned the war STARTED in February 04.